South Sudan on Thursday called for foreign military intervention over armed confrontation involving forces loyal to its military wing, the Sudan People’s Liberation Army (SPLA) and the northern Sudan Armed Forces in the northern border state of South Kordofan.

Joseph Ukel, minister of higher education in the government of South Sudan, told Sudan Tribune that the fighting in the Nuba Mountains of South Kordofan would not stop unless foreign forces intervene.

"There is a need for foreign military intervention because nothing will stop the ongoing fighting in the Nuba Mountains from resuming anytime soon since the government of Sudan as officially announced allowing its forces to drive out SPLA forces from the area", Ukel said.

The Khartoum government gave SPLA forces from South Kordofan and Blue Nile an ultimatum to move south of the border or disarm otherwise they would be attacked by the Sudan Armed Forces.

Despite fighting with SPLA, which became the official army of the south as part of a 2005 peace deal, many people from South Kordofan and Blue Nile joined the southern rebels in the civil war against Khartoum.

The 2005 peace deal gave the people South Sudan and Abyei right to self determination while granting Nuba Mountains and Blue Nile States in central Sudan "popular consultations" to assess and determine the system of governance after the end of the six year interim period.

In January the South opted to secede, leaving the two states in north Sudan and still governed by the National Congress Party (NCP) in Khartoum.

The Comprehensive Peace Agreement states that the popular consultations cannot go ahead until a state legislative assembly and governor have been elected.

Blue Nile State took part in last years general elections, which were marred with allegations of frauds and intimidation, returning Malik Agar the candidate from the SPLM, the political wing of the former SPLA rebels.

However in South Kordofan the elections were delayed over disputed results of a national census, conducted in 2008. A new census was conducted in March, 2011 and accepted by all the parties paving the way for conduct of the elections held in May 2-4.

The NCP won the election, which was endorsed by international observers, by 6,500. The SPLM rejected the results claiming there were irregularities in the aggregation process and said it would not share any government brought into the power as part of the election.

On Sunday the Sudan Armed Forces moved into Kadugli, capital of South Kordofan State, with tanks and other heavy machine guns mounted on military vehicles, thus prompting an eruption of a fighting.

The fighting which began in Kadugli on Saturday, and resumed on Sunday in the town and surrounding areas.

Eye witnesses in Dilling told Sudan Tribune on Wednesday that a commanding officer of the Sudan Armed Forces in the area was killed along with eight other soldiers. A senior SPLA military officer was also reported to have been killed with two of his bodyguards.

The United Nations Mission in Sudan office in Kadugli on Tuesday and Wednesday in an interview with Sudan Tribune confirmed eruption of fighting in the town and subsequent killing of six people, 4 of whom were government police and 2 civilians but said it subsided on Thursday, though there were erratic shootings.

While the SPLM had reported killing of 17 on Tuesday, eyes witnesses including employees of international organizations in the area say a lot more people have been killed. No independent report has confirmed the killing and it was not clear whether figures of people killed six reported by the United Nations were part of the SPLM’s report or not.

The United Nations also announced it was suspending its operational activities on Tuesday and relocated over 300 staff members of UN agencies and international organization out of the area. Multiple sources in Kadugli in on Thursday told Sudan Tribune on Thursday that UN has relocated its staff members including staff members of the international organizations to various locations in Sudan.

International relief organizations were forced to leave as they were unable to perform their normal duties due to lack of access to the injured as well as water and electricity shortages, a source in the area said.

"It was tough yesterday. There was fire in every direction," says a UN source who did not want to be named.

"It was a cat and mouse game going on in the town yesterday between the armed forces. I cannot [tell] who was who among them anymore. We even had people coming to our camp and snatching people suspected as political supporters," the source said.